This document discusses and compares three open source digital library platforms: Koha, Omeka, and ResourceSpace. It provides an overview of each platform, including requirements, installation, customization, and examples of them in use. Koha is an integrated library system for cataloging and circulation. Omeka is for digital archives and online exhibits. ResourceSpace is a digital asset management platform that automatically harvests metadata. Requirements for hosting include a LAMP stack on Amazon EC2 micro instances or similar virtual servers. Customization involves modifying PHP, CSS, themes, plugins and other aspects of each system.